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[ARM] 4377/1: KS8695: GPIO driver
Driver to control the GPIO pins on the KS8695 processor. The driver natively supports the Generic GPIO interface. Signed-off-by: Andrew Victor <andrew@sanpeople.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Andrew Victor
Russell King
parent
7dcca30a32
commit
8a87a996ea
@ -308,6 +308,7 @@ config ARCH_L7200
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config ARCH_KS8695
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bool "Micrel/Kendin KS8695"
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select GENERIC_GPIO
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help
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Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
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System-on-Chip devices.
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@ -3,7 +3,7 @@
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# Makefile for KS8695 architecture support
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#
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obj-y := cpu.o irq.o time.o devices.o
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obj-y := cpu.o irq.o time.o gpio.o devices.o
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obj-m :=
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obj-n :=
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obj- :=
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218
arch/arm/mach-ks8695/gpio.c
Normal file
218
arch/arm/mach-ks8695/gpio.c
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@ -0,0 +1,218 @@
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/*
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* arch/arm/mach-ks8695/gpio.c
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*
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* Copyright (C) 2006 Andrew Victor
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <asm/io.h>
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#include <asm/hardware.h>
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#include <asm/mach/irq.h>
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#include <asm/arch/regs-gpio.h>
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#include <asm/arch/gpio.h>
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/*
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* Configure a GPIO line for either GPIO function, or its internal
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* function (Interrupt, Timer, etc).
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*/
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static void __init_or_module ks8695_gpio_mode(unsigned int pin, short gpio)
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{
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unsigned int enable[] = { IOPC_IOEINT0EN, IOPC_IOEINT1EN, IOPC_IOEINT2EN, IOPC_IOEINT3EN, IOPC_IOTIM0EN, IOPC_IOTIM1EN };
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unsigned long x, flags;
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if (pin > KS8695_GPIO_5) /* only GPIO 0..5 have internal functions */
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return;
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local_irq_save(flags);
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x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
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if (gpio) /* GPIO: set bit to 0 */
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x &= ~enable[pin];
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else /* Internal function: set bit to 1 */
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x |= enable[pin];
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__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPC);
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local_irq_restore(flags);
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}
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static unsigned short gpio_irq[] = { KS8695_IRQ_EXTERN0, KS8695_IRQ_EXTERN1, KS8695_IRQ_EXTERN2, KS8695_IRQ_EXTERN3 };
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/*
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* Configure GPIO pin as external interrupt source.
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*/
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int __init_or_module ks8695_gpio_interrupt(unsigned int pin, unsigned int type)
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{
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unsigned long x, flags;
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if (pin > KS8695_GPIO_3) /* only GPIO 0..3 can generate IRQ */
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return -EINVAL;
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local_irq_save(flags);
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/* set pin as input */
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x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
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x &= ~IOPM_(pin);
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__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
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local_irq_restore(flags);
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/* Set IRQ triggering type */
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set_irq_type(gpio_irq[pin], type);
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/* enable interrupt mode */
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ks8695_gpio_mode(pin, 0);
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return 0;
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}
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EXPORT_SYMBOL(ks8695_gpio_interrupt);
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/* .... Generic GPIO interface .............................................. */
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/*
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* Configure the GPIO line as an input.
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*/
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int __init_or_module gpio_direction_input(unsigned int pin)
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{
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unsigned long x, flags;
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if (pin > KS8695_GPIO_15)
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return -EINVAL;
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/* set pin to GPIO mode */
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ks8695_gpio_mode(pin, 1);
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local_irq_save(flags);
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/* set pin as input */
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x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
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x &= ~IOPM_(pin);
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__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
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local_irq_restore(flags);
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return 0;
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}
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EXPORT_SYMBOL(gpio_direction_input);
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/*
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* Configure the GPIO line as an output, with default state.
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*/
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int __init_or_module gpio_direction_output(unsigned int pin, unsigned int state)
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{
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unsigned long x, flags;
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if (pin > KS8695_GPIO_15)
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return -EINVAL;
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/* set pin to GPIO mode */
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ks8695_gpio_mode(pin, 1);
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local_irq_save(flags);
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/* set line state */
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x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
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if (state)
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x |= (1 << pin);
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else
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x &= ~(1 << pin);
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__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD);
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/* set pin as output */
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x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
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x |= IOPM_(pin);
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__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
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local_irq_restore(flags);
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return 0;
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}
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EXPORT_SYMBOL(gpio_direction_output);
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/*
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* Set the state of an output GPIO line.
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*/
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void gpio_set_value(unsigned int pin, unsigned int state)
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{
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unsigned long x, flags;
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if (pin > KS8695_GPIO_15)
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return;
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local_irq_save(flags);
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/* set output line state */
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x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
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if (state)
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x |= (1 << pin);
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else
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x &= ~(1 << pin);
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__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD);
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(gpio_set_value);
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/*
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* Read the state of a GPIO line.
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*/
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int gpio_get_value(unsigned int pin)
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{
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unsigned long x;
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if (pin > KS8695_GPIO_15)
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return -EINVAL;
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x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
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return (x & (1 << pin)) != 0;
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}
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EXPORT_SYMBOL(gpio_get_value);
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/*
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* Map GPIO line to IRQ number.
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*/
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int gpio_to_irq(unsigned int pin)
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{
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if (pin > KS8695_GPIO_3) /* only GPIO 0..3 can generate IRQ */
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return -EINVAL;
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return gpio_irq[pin];
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}
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EXPORT_SYMBOL(gpio_to_irq);
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/*
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* Map IRQ number to GPIO line.
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*/
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int irq_to_gpio(unsigned int irq)
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{
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if ((irq < KS8695_IRQ_EXTERN0) || (irq > KS8695_IRQ_EXTERN3))
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return -EINVAL;
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return (irq - KS8695_IRQ_EXTERN0);
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}
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EXPORT_SYMBOL(irq_to_gpio);
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79
include/asm-arm/arch-ks8695/gpio.h
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79
include/asm-arm/arch-ks8695/gpio.h
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@ -0,0 +1,79 @@
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/*
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* include/asm-arm/arch-ks8695/gpio.h
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*
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* Copyright (C) 2006 Andrew Victor
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARCH_GPIO_H_
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#define __ASM_ARCH_GPIO_H_
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#define KS8695_GPIO_0 0
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#define KS8695_GPIO_1 1
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#define KS8695_GPIO_2 2
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#define KS8695_GPIO_3 3
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#define KS8695_GPIO_4 4
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#define KS8695_GPIO_5 5
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#define KS8695_GPIO_6 6
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#define KS8695_GPIO_7 7
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#define KS8695_GPIO_8 8
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#define KS8695_GPIO_9 9
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#define KS8695_GPIO_10 10
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#define KS8695_GPIO_11 11
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#define KS8695_GPIO_12 12
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#define KS8695_GPIO_13 13
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#define KS8695_GPIO_14 14
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#define KS8695_GPIO_15 15
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/*
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* Configure GPIO pin as external interrupt source.
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*/
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int __init_or_module ks8695_gpio_interrupt(unsigned int pin, unsigned int type);
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/*
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* Configure the GPIO line as an input.
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*/
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int __init_or_module gpio_direction_input(unsigned int pin);
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/*
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* Configure the GPIO line as an output, with default state.
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*/
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int __init_or_module gpio_direction_output(unsigned int pin, unsigned int state);
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/*
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* Set the state of an output GPIO line.
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*/
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void gpio_set_value(unsigned int pin, unsigned int state);
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/*
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* Read the state of a GPIO line.
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*/
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int gpio_get_value(unsigned int pin);
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/*
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* Map GPIO line to IRQ number.
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*/
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int gpio_to_irq(unsigned int pin);
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/*
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* Map IRQ number to GPIO line.
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*/
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int irq_to_gpio(unsigned int irq);
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#include <asm-generic/gpio.h>
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static inline int gpio_request(unsigned int pin, const char *label)
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{
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return 0;
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}
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static inline void gpio_free(unsigned int pin)
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{
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}
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#endif
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